Which of the following is NOT a component of a CPU?

The correct answer is option 4: Hard Disk

Key Points

The CPU (Central Processing Unit) is the main part of a computer that performs calculations and controls other parts of the system. It mainly consists of the following components:

• Arithmetic Logic Unit (ALU): Performs arithmetic and logical operations ✅
• Control Unit (CU): Directs operations of the processor and coordinates components ✅
• Cache Memory: A small, high-speed memory inside or near the CPU used to store frequently accessed data ✅

Hard Disk, however, is a secondary storage device used to store data permanently. It is not a component of the CPU.

Explanation of options:

• Option 1 – ALU: ❌ Part of the CPU ✅
• Option 2 – CU: ❌ Part of the CPU ✅
• Option 3 – Cache Memory: ❌ Closely associated with CPU ✅
• Option 4 – Hard Disk: ✅ Not a part of CPU ❌

Hence, the correct answer is: option 4: Hard Disk